Intermec PEN*KEY 6100, Programmer'S Reference Manual

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SECTION 7 Reference, System Information
7-12 PEN*KEY
R
6100 Computer Programmer’s Reference Guide
Table 7Ć7 (Continued)
BIOS Data in System RAM
Addr Description Size
40:67 dword Segmented address of video option ROM
40:6B byte Reserved: the last interrupt that occurred
40:6C word Time of day counter, low word
40:6E word Time of day counter, high word
40:70 byte Timer overflow indicator
40:71 byte System break flag
40:72 word System reset flag
40:74 byte Reserved: last hard disk status
40:75 byte Number of fixed drives
40:76 byte Reserved: fixed disk control byte
40:77 byte Reserved: fixed disk port offset
40:78 4 bytes Reserved: printer timeĆout table
40:7C 4 bytes Serial timeĆout table
40:80 word Offset to start of keyboard buffer
40:82 word Offset to end of keyboard buffer
40:84 byte
Number of rows on screen(24/25)
40:85 word
Character height (bytes/char)
40:87 byte
video control bit flags
40:88 byte
Video feature bit flags
40:89 byte
VGA control bit flags
40:8A byte
Display combo code table index
40:8B byte Reserved: diskette data rate info
40:8C byte Reserved: fixed disk status register
40:8D byte Reserved: fixed disk error register
40:8E byte Reserved: fixed disk interrupt flag
40:8F byte Reserved: diskette controller information
40:90 byte Media type for drive 0
40:91 byte Media type for drive 1
40:92 byte Media type for drive 2
40:93 byte Media type for drive 3
40:94 2 bytes Reserved: current track for each drive
40:96 byte Keyboard status byte
40:97 byte Keyboard LED status byte
40:98 dword Segmented pointer to user wait flag
40:9C dword Wait timeĆout data word
40:A0 byte Wait active flag
40:A1 39 bytes Reserved
40:C8 10 bytes Reserved for real mode restart stackĊ
used by RESTART
40:D2 word RSĆ232 timeĆout counterĊused by interrupt 14h
40:D4 4 bytes ReservedĊ
used by POST
40:D8 20 words ReservedĊ
for NORAND BIOS
7. Reference,
System Information